Humidifier



FIG. 1 is a front view of a humidifier showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The dashed or broken lines shown in the drawings depict portions of the humidifier in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a humidifier, as shown and described. 